21157425662 has 16 divisors (see below), whose sum is σ = 33084249984. Its totient is φ = 10136100000.

The previous prime is 21157425647. The next prime is 21157425673. The reversal of 21157425662 is 26652475112.

It is a super-2 number, since 2×21157425662² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1683089 + ... + 1695612.

It is an arithmetic number, because the mean of its divisors is an integer number (2067765624).

Almost surely, 2^21157425662 is an apocalyptic number.

21157425662 is a deficient number, since it is larger than the sum of its proper divisors (11926824322).

21157425662 is a wasteful number, since it uses less digits than its factorization.

21157425662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378835.

The product of its digits is 201600, while the sum is 41.

The spelling of 21157425662 in words is "twenty-one billion, one hundred fifty-seven million, four hundred twenty-five thousand, six hundred sixty-two".